package com.test.link;

public class MergeTwoLists {
    public static  ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        if (l1 == null) return l2;
        if (l2 == null) return l1;
        if (l1.val <= l2.val) {
            l1.next = mergeTwoLists(l1.next, l2);
            return l1;
        } else {
            l2.next = mergeTwoLists(l1, l2.next);
            return l2;
        }
    }
    public static void main(String[] args) {
        ListNode l1 = new ListNode(1);
        l1.next=new ListNode(2);
        l1.next.next=new ListNode(4);

        ListNode l2 = new ListNode(1);
        l2.next=new ListNode(3);
        l2.next.next=new ListNode(4);
        ListNode listNode = mergeTwoLists(l1,l2);
    }
}
